Metering and mixing pump



June 1966 e. E. BREDERHOFF 3,256,821

METERING AND MIXING PUMP 2 Sheets-Sheet 1 Filed Dec. 18, 1964 FIG 2 INVENTOR G untherE Bredarhoff' ATTORNEYS 2 Sheets-Sheet 2 I/O INVENTOR GUM: w 5: Brederhufi m w am M ATTORNEY$ G. E. BREDERHOFF METERING AND MIXING PUMP June 21, 1966 Filed Dec. 18, 1964 United States Patent 3,256,821 METERING AND MIXING PUMP Giinther E. Brederhofi, Hamelinger Str. 14, Herford, Germany Filed Dec. 18, 1964, Ser. No. 419,323 1 Claim. (Cl. 103-7) This invention relates to a metering and mixing pump wherein two or more fluids and/or gases are metered, mixed and discharged from a single pump of simple construction and inexpensive design. As it is known, the customary measuring or metering pump is a pump with which one substance is measured and transported by a discharge control mechanism attached to said pump.

The present invention, however, renders it possible to measure and mix two or more substances in liquid phase, in gaseous phase or in gaseous and liquid phases.

It is an object of the present invention to develop a mixing and metering pump capable of metering, mixing and transporting two or more substances utilizing a simple piston pump.

Another object of the present invention is to develop a metering and mixing pump comprising a circular cylinder and reciprocating and rotating piston; said cylinder having an entrance port chamber substantially as long as one-half the length of said piston; said entrance port chamber communicating with said cylinder through an entrance port slot as long as said entrance port chamber; a plurality of feed inlets in said entrance port chamber; adjustable means to subdivide said entrance port chamber perpendicular to said entrance port slot; said cylinder having a delivery port chamber approximately opposite said entrance port chamber and substantially as long as one-half the length of said piston, said delivery port chamber communicating with said cylinder through a delivery port slot as long as said delivery port chamber; at least one feed outlet from said delivery port chamber; said piston having a groove therein capable of communicating with only one of said entrance port slot and said delivery port slot during a 180 rotation of said piston; an internal channel in said piston communicating with said groove and the piston head and .means to move said piston in a reciprocating direction and to simultaneously rotate said piston whereby said piston is rotated 180 during each stroke.

These and other objects of the invention will become more apparent as the description thereof proceeds.

According to the invention, the metering and mixing pump comprises a piston, provided in radial relation with a groove, which is inset around the piston wall for a distance of about 180. The groove is connected by means of an internal duct within the piston having an outlet through said piston head. On the side of the cylinder jacket and in axial arrangement thereto an inlet chamber is disposed with the outlet chamber disposed exactly opposite to the inlet chamber. This inlet chamber is provided with an adjustable control to subdivide the inlet chamber. The piston is axially rotated 360 during the up and down motion of the two strokes. The stroke and the rotation of piston are eifected, as it is generally known, with suitable elements. By disposing two or several pistons in tandem arrangement or in double-piston arrangement, it is possible to measure and to mix three or more agents In the drawings:

FIGURE 1 is a top View of the metering and mixing pump of the invention;

FIGURE 2 is a side cross-section view of the metering and mixing pump along lines 22 of FIGURE 1;

FIGURE 3 is another side cross-section view of the metering and mixing pump along lines 22 of FIGURE 1 with the piston at mid-position of its down stroke;

3,256,821 Patented June 21, 1966 FIGURE 4 is a top cross-section view of the metering and mixing pump along lines 4-4 of FIGURE 2;

FIGURE 5 is another top cross-section view of the metering and mixing pump along lines 55 of FIGURE 3 with the piston at mid-position of its down stroke;

FIGURE 6 is another top cross-section view of the metering and mixing pump with the piston at mid-position of its up stroke.

With this metering and mixing pump of the invention nearly all metering problems may be solved in an operationally practical and economical manner. The pump simplifies the accomplishment of many problems concerning the modern manufacturing process and renders the automatization of-entire production proceedings possible. With mathematical accuracy and greatest possible certainty, this pump meters nearly all types of media from zero to maximum and is adjustable without stages at standstill as well as during operation. The control may be accomplished either manually or automatically (electrical, pneumatic or hydraulic).

The pump comprises in its construction parts only such elements as have proved satisfactory in piston pumps over the years. The pump can be manufactured'in either single-cylinder or in twin-cylinder models, in the latter case also as an opposed cylinder type.

Utilizing the metering and mixing pump of the present invention in single piston arrangement, it is possible to mix, meter and pump to a single receiver or reactor mixtures of gasolines of various octane ratings. The pump also finds a utility in pumping a fuel-air mixture to firing cylinders in an internal combustion motor. In addition it is useful in the chemical processing industry.

The. metering and mixing pump is constructed of any type of material utilized in the particular industry to which it is to be applied. The pump may also be provided with a heating or cooling jacket to be able to meter and mix any media, which have to be either heated or cooled while traveling through the pump.

Referring to the drawings, an optimum embodiment of the metering and mixing pump is shown.

FIGURE 1 represents a top view of the mixing and metering pump. This consists of acircular cylinder jacket 10 containing a piston 11 which rotates approxi-,

mately with each stroke so that with a complete cycle of a down stroke and an up stroke,'the piston 11 has rotated 360. Within the piston at approximately its midpoint is a groove 12 in circumferential arrangement about 180 of the piston circumference, less the distance corresponding to the opening of the entrance port slot 13 or the opening of the delivery port slot 14. Within the piston 11 is a duct 15 communicating from the groove 12 to the piston head. The entrance port slot 13 communicates with an entrance port chamber 16 which in turn is connected with feed inlets. The delivery port slot 14 communicates with a delivery port chamber 17 which in turn is connected with feed outlets. The delivery port slot 14 is approximately directly opposite the entrance port slot 13 and of the same length. Both slots are approximately as long as the piston stroke and are of sufiicient width to allow free flow of the medium being pumped without undue restriction.

FIGURE 2 represents a side cross-section of the pump along line 22 of FIGURE 1. The piston 11 is shown at the top of its up stroke with the groove 12 about to communicate with the entrance port slot 13, having just ended communication with delivery port slot 14. As piston 11 begins its down stroke, it rotates simultaneously and at an even rate opening a communication from the entrance port chamber 16 through the entrance port slot 13 to the groove 12. Vacuum created in the opening distance between the cylinder head and the piston head causes the medium present in the entrance port chamber 16 to be drawn through the entrance port slot 13, the groove 12 and the inner duct 15 to this opening distance. The entrance port chamber 16 can be of any convenient configuration and is divided by adjustable means such as a dividing piston 18 into two or more sections, each of which is fed by a separate feed inlet shown as 19 and 20. With the continued down stroke and rotation of the piston, the upper section of the entrance port chamber 16 no longer communicates with the groove 12 and the lower section of the entrance port chamber 16 starts to communicate with the groove 12 thus drawing the second medium fed by feed inlet 20 into the pump as depicted by FIGURE 3. Due to the whirling motion of the piston the two mediums present are intimately mixed. As the piston reaches the bottom of its stroke it has rotated to the point where the trailing edge of the groove 12 is no longer in communication with entrance port slot 13. The leading edge of the groove 12 is almost in communication with delivery port slot 14 and as the piston 11 continues to rotate and start its up stroke, communication is effected with the delivery port slot and the mixed media above the piston is forced through inner duct 15, groove 12 and delivery port slot 14 into delivery port chamber 17 and out the outlet 21.

FIGURE 4 represents a top cross-section view of the pump along line 44 of FIGURE 2 showing the position of groove 12 at the start of the down stroke of piston 11. FIGURE 5 represents a top cross-section view of the pump along line 5-5 of FIGURE 3 showing the position of the groove 12 at the midpoint of the down stroke of piston 11. FIGURE 6 represents a top cross-section view of the pump showing the position of the groove 12 at the midpoint of the up stroke of piston 11.

By up and down movement of the dividing piston 18 in the inlet entrance port chamber 16, a metering of from zero to maximum of each of two mediums may be ascertained with mathematic accuracy according to the position of the dividing piston 18 in percentage relation of the adjustment path and adjustment length.

The conveying capacity of the pump depends upon its size and speed of stroke and can vary widely.

It will be apparent to those skilled in the art that many alterations of the structure herein described and illustrated by way of example are possible without departing from the spirit of the invention and the scope of the appended claim.

I claim:

A metering and mixing pump comprising a circular cylinder and reciprocating and rotating piston; said cylinder having an entrance port chamber substantially as long as one-half the length of said piston; said entrance port chamber communicating with said cylinder through an entrance port slot as long as said entrance port chamber; a plurality of feed inlets in said entrance port chamber;

adjustable means to subdivide said entrance port chamberperpendicular to said entrance port slot; said cylinder having a delivery port chamber approximately opposite said entrance port chamber and substantially as long as one-half the length of said piston, said delivery port cham- 'ber communicating with said cylinder through a delivery port slot as long as said delivery port chamber; at least one feed outlet from said delivery port chamber; said piston having a groove therein capable of communicating with only one of said entrance 'port slot and said delivery port slot during a rotation of said piston; an internal channel in said piston communicating with said groove and the piston head and means to move said piston in a reciprocating direction and to simultaneously rotate said piston whereby said piston is rotated 180 during each stroke.

References Cited by the Examiner UNITED STATES PATENTS 1,099,155 6/1914 Ahlbom 103157 1,312,962 8/1919 Dourte 103157 1,391,676 9/1921 Finley 1037 2,440,196 4/ 1948 Fenney 103'-7 FOREIGN PATENTS 667,102 10/ 1938 Germany.

SAMUEL LEVINE, Primary Examiner.

W. L. FREEH, Assistant Examiner. 

